/*
* PCIMT specific code
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1996, 97, 98, 2000, 03, 04, 06 Ralf Baechle (ralf@linux-mips.org)
* Copyright (C) 2006,2007 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/pci.h>
#include <linux/serial_8250.h>
#include <asm/sni.h>
#include <asm/time.h>
#include <asm/i8259.h>
#include <asm/irq_cpu.h>
#define cacheconf (*(volatile unsigned int *)PCIMT_CACHECONF)
#define invspace (*(volatile unsigned int *)PCIMT_INVSPACE)
static void __init sni_pcimt_sc_init(void)
{
unsigned int scsiz, sc_size;
scsiz = cacheconf & 7;
if (scsiz == 0) {
printk("Second level cache is deactivated.\n");
return;
}
if (scsiz >= 6) {
printk("Invalid second level cache size configured, "
"deactivating second level cache.\n");
cacheconf = 0;
return;
}
sc_size = 128 << scsiz;
printk("%dkb second level cache detected, deactivating.\n", sc_size);
cacheconf = 0;
}
/*
* A bit more gossip about the iron we're running on ...
*/
static inline void sni_pcimt_detect(void)
{
char boardtype[80];
unsigned char csmsr;
char *p = boardtype;
unsigned int asic;
csmsr = *(volatile unsigned char *)PCIMT_CSMSR;
p += sprintf(p, "%s PCI", (csmsr & 0x80) ? "RM200" : "RM300");
if ((csmsr & 0x80) == 0)
p += sprintf(p, ", board revision %s",
(csmsr & 0x20) ? "D" : "C");
asic = csmsr & 0x80;
asic = (csmsr & 0x08) ? asic : !asic;
p += sprintf(p, ", ASIC PCI Rev %s", asic ? "1.0" : "1.1");
printk("%s.\n", boardtype);
}
#define PORT(_base,_irq) \
{ \
.iobase = _base, \
.irq = _irq, \
.uartclk = 1843200, \
.iotype = UPIO_PORT, \
.flags = UPF_BOOT_AUTOCONF, \
}
static struct plat_serial8250_port pcimt_data[] = {
PORT(0x3f8, 4),
PORT(0x2f8, 3),
{ },
};
static struct platform_device pcimt_serial8250_device = {
.name = "serial8250",
.id = PLAT8250_DEV_PLATFORM,
.dev = {
.platform_data = pcimt_data,
},
};
static struct resource pcimt_cmos_rsrc[] = {
{
.start = 0x70,
.end = 0x71,
.flags = IORESOURCE_IO
},
{
.start = 8,
.end = 8,
.flags = IORESOURCE_IRQ
}
};
static struct platform_device pcimt_cmos_device = {
.name = "rtc_cmos",
.num_resources = ARRAY_SIZE(pcimt_cmos_rsrc),
.resource = pcimt_cmos_rsrc
};
static struct resource sni_io_resource = {
.start = 0x00000000UL,
.end = 0x03bfffffUL,
.name = "PCIMT IO MEM",
.flags = IORESOURCE_IO,
};
static struct resource pcimt_io_resources[] = {
{
.start = 0x00,
.end = 0x1f,
.name = "dma1",
.flags = IORESOURCE_BUSY
}, {
.start = 0x40,
.end = 0x5f,
.name = "timer",
.flags = IORESOURCE_BUSY
}, {
.start = 0x60,
.end = 0x6f,
.name = "keyboard",
.flags = IORESOURCE_BUSY
}, {
.start = 0x80,
.end = 0x8f,
.name = "dma page reg",
.flags = IORESOURCE_BUSY
}, {
.start = 0xc0,
.end = 0xdf,
.name = "dma2",
.flags = IORESOURCE_BUSY
}, {
.start = 0xcfc,
.end = 0xcff,
.name = "PCI config data",
.flags = IORESOURCE_BUSY
}
};
static struct resource pcimt_mem_resources[] = {
{
/*
* this region should only be 4 bytes long,
* but it's 16MB on all RM300C I've checked
*/
.start = 0x1a000000,
.end = 0x1affffff,
.name = "PCI INT ACK",
.flags = IORESOURCE_BUSY
}
};
static struct resource sni_mem_resource = {
.start = 0x18000000UL,
.end = 0x1fbfffffUL,
.name = "PCIMT PCI MEM",
.flags = IORESOURCE_MEM
};
static void __init sni_pcimt_resource_init(void)
{
int i;
/* request I/O space for devices used on all i[345]86 PCs */
for (i = 0; i < ARRAY_SIZE(pcimt_io_resources); i++)
request_resource(&sni_io_resource, pcimt_io_resources + i);
/* request MEM space for devices used on all i[345]86 PCs */
for (i = 0; i < ARRAY_SIZE(pcimt_mem_resources); i++)
request_resource(&sni_mem_resource, pcimt_mem_resources + i);
}
extern struct pci_ops sni_pcimt_ops;
#ifdef CONFIG_PCI
static struct pci_controller sni_controller = {
.pci_ops = &sni_pcimt_ops,
.mem_resource = &sni_mem_resource,
.mem_offset = 0x00000000UL,
.io_resource = &sni_io_resource,
.io_offset = 0x00000000UL,
.io_map_base = SNI_PORT_BASE
};
#endif
static void enable_pcimt_irq(struct irq_data *d)
{
unsigned int mask = 1 << (d->irq - PCIMT_IRQ_INT2);
*(volatile u8 *) PCIMT_IRQSEL |= mask;
}
void disable_pcimt_irq(struct irq_data *d)
{
unsigned int mask = ~(1 << (d->irq - PCIMT_IRQ_INT2));
*(volatile u8 *) PCIMT_IRQSEL &= mask;
}
static struct irq_chip pcimt_irq_type = {
.name = "PCIMT",
.irq_mask = disable_pcimt_irq,
.irq_unmask = enable_pcimt_irq,
};
/*
* hwint0 should deal with MP agent, ASIC PCI, EISA NMI and debug
* button interrupts. Later ...
*/
static void pcimt_hwint0(void)
{
panic("Received int0 but no handler yet ...");
}
/*
* hwint 1 deals with EISA and SCSI interrupts,
*
* The EISA_INT bit in CSITPEND is high active, all others are low active.
*/
static void pcimt_hwint1(void)
{
u8 pend = *(volatile char *)PCIMT_CSITPEND;
unsigned long flags;
if (pend & IT_EISA) {
int irq;
/*
* Note: ASIC PCI's builtin interrupt acknowledge feature is
* broken. Using it may result in loss of some or all i8259
* interrupts, so don't use PCIMT_INT_ACKNOWLEDGE ...
*/
irq = i8259_irq();
if (unlikely(irq < 0))
return;
do_IRQ(irq);
}
if (!(pend & IT_SCSI)) {
flags = read_c0_status();
clear_c0_status(ST0_IM);
do_IRQ(PCIMT_IRQ_SCSI);
write_c0_status(flags);
}
}
/*
* hwint 3 should deal with the PCI A - D interrupts,
*/
static void pcimt_hwint3(void)
{
u8 pend = *(volatile char *)PCIMT_CSITPEND;
int irq;
pend &= (IT_INTA | IT_INTB | IT_INTC | IT_INTD);
pend ^= (IT_INTA | IT_INTB | IT_INTC | IT_INTD);
clear_c0_status(IE_IRQ3);
irq = PCIMT_IRQ_INT2 + ffs(pend) - 1;
do_IRQ(irq);
set_c0_status(IE_IRQ3);
}
static void sni_pcimt_hwint(void)
{
u32 pending = read_c0_cause() & read_c0_status();
if (pending & C_IRQ5)
do_IRQ(MIPS_CPU_IRQ_BASE + 7);
else if (pending & C_IRQ4)
do_IRQ(MIPS_CPU_IRQ_BASE + 6);
else if (pending & C_IRQ3)
pcimt_hwint3();
else if (pending & C_IRQ1)
pcimt_hwint1();
else if (pending & C_IRQ0) {
pcimt_hwint0();
}
}
void __init sni_pcimt_irq_init(void)
{
int i;
*(volatile u8 *) PCIMT_IRQSEL = IT_ETH | IT_EISA;
mips_cpu_irq_init();
/* Actually we've got more interrupts to handle ... */
for (i = PCIMT_IRQ_INT2; i <= PCIMT_IRQ_SCSI; i++)
irq_set_chip_and_handler(i, &pcimt_irq_type, handle_level_irq);
sni_hwint = sni_pcimt_hwint;
change_c0_status(ST0_IM, IE_IRQ1|IE_IRQ3);
}
void __init sni_pcimt_init(void)
{
sni_pcimt_detect();
sni_pcimt_sc_init();
ioport_resource.end = sni_io_resource.end;
#ifdef CONFIG_PCI
PCIBIOS_MIN_IO = 0x9000;
register_pci_controller(&sni_controller);
#endif
sni_pcimt_resource_init();
}
static int __init snirm_pcimt_setup_devinit(void)
{
switch (sni_brd_type) {
case SNI_BRD_PCI_MTOWER:
case SNI_BRD_PCI_DESKTOP:
case SNI_BRD_PCI_MTOWER_CPLUS:
platform_device_register(&pcimt_serial8250_device);
platform_device_register(&pcimt_cmos_device);
break;
}
return 0;
}
device_initcall(snirm_pcimt_setup_devinit);